812197090 has 16 divisors (see below), whose sum is σ = 1478382840. Its totient is φ = 321228160.

The previous prime is 812197079. The next prime is 812197093. The reversal of 812197090 is 90791218.

It can be written as a sum of positive squares in 4 ways, for example, as 557762689 + 254434401 = 23617^2 + 15951^2 .

It is a super-2 number, since 2×812197090² = 1319328226008936200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (812197093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 455401 + ... + 457180.

Almost surely, 2^812197090 is an apocalyptic number.

812197090 is a deficient number, since it is larger than the sum of its proper divisors (666185750).

812197090 is a wasteful number, since it uses less digits than its factorization.

812197090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 912677.

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 812197090 is about 28499.0717392690. The cubic root of 812197090 is about 933.0118142827.

The spelling of 812197090 in words is "eight hundred twelve million, one hundred ninety-seven thousand, ninety".